diff --git a/modules/juce_audio_devices/native/juce_linux_Midi.cpp b/modules/juce_audio_devices/native/juce_linux_Midi.cpp
index 5f6d67e1d4..eee87dee7b 100644
--- a/modules/juce_audio_devices/native/juce_linux_Midi.cpp
+++ b/modules/juce_audio_devices/native/juce_linux_Midi.cpp
@@ -279,7 +279,7 @@ public:
 
     void deletePort (Port* port)
     {
-        ports.remove (port->portId);
+        ports.set (port->portId, nullptr);
         decReferenceCount();
     }